Some of the coal mines use dragline for the overburden removal of coal top as its geometric, since the initial cost is high with low running cost. Most of the draglines operating in Indian mines have conventional analog control under Ward—Leonard method. To improve the efficiency of those, to reduce the power consumption and to provide maintenance-less operation in the electrical system, the microprocessor-based digital control system is proposed to replace the analog method of control. This paper analyzes and presents a case study of real time performance of one upgraded digitally controlled Ward—Leonard dragline, operating in an Indian mine-field. It shows the improvement in specific energy consumption and suggests maintenance issues based on the comparative study of breakdown status before and after the upgradation.

中文翻译：

---

数字化改造病房的性能分析——伦纳德控制拉铲——以煤矿为例

部分煤矿采用拉铲铲除煤顶为其几何形状，初期成本高，运行成本低。印度矿山中的大多数拉铲挖掘机都采用 Ward-Leonard 方法下的传统模拟控制。为了提高这些系统的效率，降低电力消耗并在电气系统中提供免维护操作，提出了基于微处理器的数字控制系统来代替模拟控制方法。本文分析并介绍了一个在印度雷区运行的升级型数控 Ward-Leonard 拉铲挖掘机的实时性能案例研究。它显示了单位能耗的改善，并根据升级前后故障状态的比较研究提出了维护问题。